Effect of hydrostatic pressure on the superconducting transition temperature and superfluid density of SmFeAsO0.85 and PrFe0.925Co0.075AsO superconductors
X. L. Dong, W. Lu, J. Yang, W. Yi, Z. C. Li, C. Zhang, Z. A. Ren, G. C. Che, L. L. Sun, F. Zhou, X. J. Zhou, Z. X. Zhao
DOI 10.1103/PhysRevB.82.212506 · Physical Review B
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Abstract
We have measured magnetic susceptibility of iron pnictide superconductors SmFeAsO0.85 and PrFe0.925Co0.075AsO under hydrostatic pressure up to 1.15 GPa. The superconducting transition temperature (TC) deceases linearly and the Meissner signal size also decreases with increasing pressure for SmFeAsO0.85. In contrast, the TC of PrFe0.925Co0.075AsO initially increases with pressure then saturates above ∼0.8 GPa. Meanwhile its Meissner signal exhibits the similar pressure dependence. Our results indicate that the pressure dependences of TC and superfluid density in both systems are positively correlated which suggests that these quaternary iron-based superconductors are not conventional BCS ones.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SmFeAsO0.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 54.6 | 0.07 GPa | onset |
| SmFeAsO0.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 53.4 | 1.1 GPa | onset |
| PrFe0.925Co0.075AsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | 0.25 GPa | onset |
| PrFe0.925Co0.075AsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | 1.15 GPa | onset |
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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